Well, it varies. Some authors might incorporate menstruation as a natural aspect of a character's life, while others might avoid it altogether if it's not relevant to the main plot of the fanfiction.
You might enjoy 'The Return of the Red Death'. In this story, the fearsome Red Death makes a comeback, and it's up to the gang to stop it. It's full of action and drama.
You can find all sorts of storylines. Some might focus on the characters' adventures after the events of the movies, while others might explore alternate universes or prequels.
Some egg laying fanfiction stories in this universe might explore the magical aspects of egg laying or the emotional bonds formed around it. You might have to do a bit of digging to find the ones that suit your taste, but they're out there!
You might find various stories. Some could focus on new adventures of the characters after the original movie, while others might explore alternate timelines or relationships.
The mix of different dragon species and their unique powers can be really exciting. Also, seeing how characters interact with these hybrids adds a new layer of adventure.